Avram notes that the introduction of a product to the real world based on one from the fictional world is nothing new, citing Holiday Inn hotel and Bubba Gump restaurant chains as examples. While he’s coined the term “tlönian” for this phenomenon, based on the Borges story “Tlön, Uqbar, Orbis Tertius,” a commenter suggests “defictionalization,” a Google search of which currently places the Making Light discussion as the #2 result, so I’m thinking it has staying power.